5 research outputs found
μ΄λ―ΈμΈ νλ‘ μ€κ³λ₯Ό μν μΈν°μ»€λ₯νΈμ νμ΄λ° λΆμ λ° λμμΈ λ£° μλ° μμΈ‘
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Όλ¬Έ (λ°μ¬) -- μμΈλνκ΅ λνμ : 곡과λν μ κΈ°Β·μ»΄ν¨ν°κ³΅νλΆ, 2021. 2. κΉνν.νμ΄λ° λΆμ λ° λμμΈ λ£° μλ° μ κ±°λ λ°λ체 μΉ© μ μ‘°λ₯Ό μν λ§μ€ν¬ μ μ μ μ μλ£λμ΄μΌ ν νμ κ³Όμ μ΄λ€.
κ·Έλ¬λ νΈλμ§μ€ν°μ μΈν°μ»€λ₯νΈμ λ³μ΄κ° μ¦κ°νκ³ μκ³ λμμΈ λ£° μμ 볡μ‘ν΄μ§κ³ μκΈ° λλ¬Έμ νμ΄λ° λΆμ λ° λμμΈ λ£° μλ° μ κ±°λ μ΄λ―ΈμΈ νλ‘μμ λ μ΄λ €μμ§κ³ μλ€.
λ³Έ λ
Όλ¬Έμμλ μ΄λ―ΈμΈ μ€κ³λ₯Ό μν λκ°μ§ λ¬Έμ μΈ νμ΄λ° λΆμκ³Ό λμμΈ λ£° μλ°μ λν΄ λ€λ£¬λ€.
첫λ²μ§Έλ‘ 곡μ μ½λμμ νμ΄λ° λΆμμ μ€λ¦¬μ½μΌλ‘ μ μλ νλ‘μ μ±λ₯μ μ νν μμΈ‘νμ§ λͺ»νλ€. κ·Έ μ΄μ λ 곡μ μ½λμμ κ°μ₯ λλ¦° νμ΄λ° κ²½λ‘κ° λͺ¨λ 곡μ 쑰건μμλ κ°μ₯ λλ¦° κ²μ μλκΈ° λλ¬Έμ΄λ€. κ²λ€κ° μΉ© λ΄μ μκ³ κ²½λ‘μμ μΈν°μ»€λ₯νΈμ μν μ§μ° μκ°μ΄ μ 체 μ§μ° μκ°μμμ μν₯μ΄ μ¦κ°νκ³ μκ³ , 10λλ
Έ μ΄ν 곡μ μμλ 20%λ₯Ό μ΄κ³Όνκ³ μλ€. μ¦, μ€λ¦¬μ½μΌλ‘ μ μλ νλ‘μ μ±λ₯μ μ νν μμΈ‘νκΈ° μν΄μλ λν νλ‘κ° νΈλμ§μ€ν°μ λ³μ΄ λΏλ§μλλΌ μΈν°μ»€λ₯νΈμ λ³μ΄λ λ°μν΄μΌνλ€. μΈν°μ»€λ₯νΈλ₯Ό ꡬμ±νλ κΈμμ΄ 10μΈ΅ μ΄μ μ¬μ©λκ³ μκ³ , κ° μΈ΅μ ꡬμ±νλ κΈμμ μ νκ³Ό μΊν¨μν΄μ€μ λΉμ μ νμ΄ λͺ¨λ νλ‘ μ§μ° μκ°μ μν₯μ μ£ΌκΈ° λλ¬Έμ λν νλ‘λ₯Ό μ°Ύλ λ¬Έμ λ μ°¨μμ΄ λ§€μ° λμ μμμμ μ΅μ μ ν΄λ₯Ό μ°Ύλ λ°©λ²μ΄ νμνλ€. μ΄λ₯Ό μν΄ μΈν°μ»€λ₯νΈλ₯Ό μ μνλ 곡μ (λ°± μλ μ€λΈ λΌμΈ)μ λ³μ΄λ₯Ό λ°μν λν νλ‘λ₯Ό μμ±νλ λ°©λ²μ μ μνμλ€. 곡μ λ³μ΄κ° μμλ κ°μ₯ λλ¦° νμ΄λ° κ²½λ‘μ μ¬μ©λ κ²μ΄νΈμ λΌμ°ν
ν¨ν΄μ λ³κ²½νλ©΄μ μ μ§μ μΌλ‘ νμνλ λ°©λ²μ΄λ€. ꡬ체μ μΌλ‘, λ³Έ λ
Όλ¬Έμμ μ μνλ ν©μ± νλ μμν¬λ λ€μμ μλ‘μ΄ κΈ°μ λ€μ ν΅ν©νμλ€: (1) λΌμ°ν
μ ꡬμ±νλ μ¬λ¬ κΈμ μΈ΅κ³Ό λΉμλ₯Ό μΆμΆνκ³ νμ μκ° κ°μλ₯Ό μν΄ μ μ¬ν ꡬμ±λ€μ κ°μ λ²μ£Όλ‘ λΆλ₯νμλ€. (2) λΉ λ₯΄κ³ μ νν νμ΄λ° λΆμμ μνμ¬ μ¬λ¬ κΈμ μΈ΅κ³Ό λΉμλ€μ λ³μ΄λ₯Ό μμννμλ€. (3) νμ₯μ±μ κ³ λ €νμ¬ μΌλ°μ μΈ λ§ μ€μ€λ μ΄ν°λ‘ λννλ‘λ₯Ό νμνμλ€.
λλ²μ§Έλ‘ λμμΈ λ£°μ 볡μ‘λκ° μ¦κ°νκ³ μκ³ , μ΄λ‘ μΈν΄ νμ€ μ
λ€μ μΈν°μ»€λ₯νΈλ₯Ό ν΅ν μ°κ²°μ μ§ννλ λμ λμμΈ λ£° μλ°μ΄ μ¦κ°νκ³ μλ€. κ²λ€κ° νμ€ μ
μ ν¬κΈ°κ° κ³μ μμμ§λ©΄μ μ
λ€μ μ°κ²°μ μ μ μ΄λ €μμ§κ³ μλ€. κΈ°μ‘΄μλ νλ‘ λ΄ λͺ¨λ νμ€ μ
μ μ°κ²°νλλ° νμν νΈλ μ, κ°λ₯ν νΈλ μ, μ΄λ€ κ°μ μ°¨μ΄λ₯Ό μ΄μ©νμ¬ μ°κ²° κ°λ₯μ±μ νλ¨νκ³ , λμμΈ λ£° μλ°μ΄ λ°μνμ§ μλλ‘ μ
λ°°μΉλ₯Ό μ΅μ ννμλ€. κ·Έλ¬λ κΈ°μ‘΄ λ°©λ²μ μ΅μ 곡μ μμλ μ ννμ§ μκΈ° λλ¬Έμ λ λ§μ μ 보λ₯Ό μ΄μ©ν νλ‘λ΄ λͺ¨λ νμ€ μ
μ¬μ΄μ μ°κ²° κ°λ₯μ±μ μμΈ‘νλ λ°©λ²μ΄ νμνλ€. λ³Έ λ
Όλ¬Έμμλ κΈ°κ³ νμ΅μ ν΅ν΄ λμμΈ λ£° μλ°μ΄ λ°μνλ μμ λ° κ°μλ₯Ό μμΈ‘νκ³ μ΄λ₯Ό μ€μ΄κΈ° μν΄ νμ€ μ
μ λ°°μΉλ₯Ό λ°κΎΈλ λ°©λ²μ μ μνμλ€. λμμΈ λ£° μλ° μμμ μ΄μ§ λΆλ₯λ‘ μμΈ‘νμκ³ νμ€ μ
μ λ°°μΉλ λμμΈ λ£° μλ° κ°μλ₯Ό μ΅μννλ λ°©ν₯μΌλ‘ μ΅μ νλ₯Ό μννμλ€. μ μνλ νλ μμν¬λ λ€μμ μΈκ°μ§ κΈ°μ λ‘ κ΅¬μ±λμλ€: (1) νλ‘ λ μ΄μμμ μ¬λ¬ κ°μ μ μ¬κ°ν 격μλ‘ λλκ³ κ° κ²©μμμ λΌμ°ν
μ μμΈ‘ν μ μλ μμλ€μ μΆμΆνλ€. (2) κ° κ²©μμμ λμμΈ λ£° μλ°μ΄ μλμ§ μ¬λΆλ₯Ό νλ¨νλ μ΄μ§ λΆλ₯λ₯Ό μννλ€. (3) λ©νν΄λ¦¬μ€ν± μ΅μ ν λλ λ² μ΄μ§μ μ΅μ νλ₯Ό μ΄μ©νμ¬ μ 체 λμμΈ λ£° μλ° κ°μκ° κ°μνλλ‘ κ° κ²©μμ μλ νμ€ μ
μ μμ§μΈλ€.Timing analysis and clearing design rule violations are the essential steps for taping out a chip. However, they keep getting harder in deep sub-micron circuits because the variations of transistors and interconnects have been increasing and design rules have become more complex. This dissertation addresses two problems on timing analysis and design rule violations for synthesizing deep sub-micron circuits.
Firstly, timing analysis in process corners can not capture post-Si performance accurately because the slowest path in the process corner is not always the slowest one in the post-Si instances. In addition, the proportion of interconnect delay in the critical path on a chip is increasing and becomes over 20% in sub-10nm technologies, which means in order to capture post-Si performance accurately, the representative critical
path circuit should reflect not only FEOL (front-end-of-line) but also BEOL (backend-of-line) variations. Since the number of BEOL metal layers exceeds ten and the layers have variation on resistance and capacitance intermixed with resistance variation on vias between them, a very high dimensional design space exploration is necessary to synthesize a representative critical path circuit which is able to provide an accurate performance prediction. To cope with this, I propose a BEOL-aware methodology of synthesizing a representative critical path circuit, which is able to incrementally explore, starting from an initial path circuit on the post-Si target circuit, routing patterns (i.e., BEOL reconfiguring) as well as gate resizing on the path circuit. Precisely, the
synthesis framework of critical path circuit integrates a set of novel techniques: (1) extracting and classifying BEOL configurations for lightening design space complexity, (2) formulating BEOL random variables for fast and accurate timing analysis, and (3) exploring alternative (ring oscillator) circuit structures for extending the applicability of this work.
Secondly, the complexity of design rules has been increasing and results in more design rule violations during routing. In addition, the size of standard cell keeps decreasing and it makes routing harder. In the conventional P&R flow, the routability of pre-routed layout is predicted by routing congestion obtained from global routing, and then placement is optimized not to cause design rule violations. But it turned out to be inaccurate in advanced technology nodes so that it is necessary to predict routability with more features. I propose a methodology of predicting the hotspots of design rule violations (DRVs) using machine learning with placement related features and the conventional routing congestion, and perturbating placed cells to reduce the number of DRVs. Precisely, the hotspots are predicted by a pre-trained binary classification model and placement perturbation is performed by global optimization methods to minimize the number of DRVs predicted by a pre-trained regression model. To do this, the framework is composed of three techniques: (1) dividing the circuit layout into multiple rectangular grids and extracting features such as pin density, cell density, global routing results (demand, capacity and overflow), and more in the placement phase, (2) predicting if each grid has DRVs using a binary classification model, and (3) perturbating the placed standard cells in the hotspots to minimize the number of DRVs predicted by a regression model.1 Introduction 1
1.1 Representative Critical Path Circuit . . . . . . . . . . . . . . . . . . . 1
1.2 Prediction of Design Rule Violations and Placement Perturbation . . . 5
1.3 Contributions of This Dissertation . . . . . . . . . . . . . . . . . . . 7
2 Methodology for Synthesizing Representative Critical Path Circuits reflecting BEOL Timing Variation 9
2.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Definitions and Overall Flow . . . . . . . . . . . . . . . . . . . . . . 12
2.3 Techniques for BEOL-Aware RCP Generation . . . . . . . . . . . . . 17
2.3.1 Clustering BEOL Configurations . . . . . . . . . . . . . . . . 17
2.3.2 Formulating Statistical BEOL Random Variables . . . . . . . 18
2.3.3 Delay Modeling . . . . . . . . . . . . . . . . . . . . . . . . 22
2.3.4 Exploring Ring Oscillator Circuit Structures . . . . . . . . . . 24
2.4 Experimental Results . . . . . . . . . . . . . . . . . . . . . . . . . . 26
2.5 Further Study on Variations . . . . . . . . . . . . . . . . . . . . . . . 37
3 Methodology for Reducing Routing Failures through Enhanced Prediction on Design Rule Violations in Placement 39
3.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
3.2 Overall Flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
3.3 Techniques for Reducing Routing Failures . . . . . . . . . . . . . . . 43
3.3.1 Binary Classification . . . . . . . . . . . . . . . . . . . . . . 43
3.3.2 Regression . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
3.3.3 Optimization . . . . . . . . . . . . . . . . . . . . . . . . . . 46
3.3.4 Placement Perturbation . . . . . . . . . . . . . . . . . . . . . 47
3.4 Experiments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
3.4.1 Experiments Setup . . . . . . . . . . . . . . . . . . . . . . . 51
3.4.2 Hotspot Prediction . . . . . . . . . . . . . . . . . . . . . . . 51
3.4.3 Regression . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
3.4.4 Placement Perturbation . . . . . . . . . . . . . . . . . . . . . 57
4 Conclusions 61
4.1 Synthesis of Representative Critical Path Circuits reflecting BEOL Timing Variation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61
4.2 Reduction of Routing Failures through Enhanced Prediction on Design Rule Violations in Placement . . . . . . . . . . . . . . . . . . . . . . 62
Abstract (In Korean) 69Docto
A Case-control Study of Sasang Constitution and Relative Risk of Stroke
μνν΅κ³νκ³Ό/μμ¬[νκΈ]μ μΈκ³μ μΈ μΆμΈμΈ μΈκ΅¬ λ
Έλ Ήνμ μ΄μ λ°λΌ μ¦κ°νλ λμ‘Έμ€μ μ€μν 보건문μ λ‘ λλλκ³ μλ€. λμ‘Έμ€μ μ¬λμ 체μ§μ λ°λΌ μ°¨μ΄κ° μμΌλ©°, λμ‘Έμ€μ λ°μλ 체μ§μ λΆκ· νμμ κ·Έ μμΈμ μ°Ύμ μ μλ€.μ΄ μ°κ΅¬λ μ¬μ체μ§κ²μ¬μ§λ‘ λΆλ₯λ 체μ§μ λ°λΌ λμ‘Έμ€μ λ°μμνμ μ°¨μ΄κ° μλκ°λ₯Ό μμλ³΄κ³ , μ¬μ체μ§μ ν¬ν¨ν λμ‘Έμ€ λ°λ³μνμ μμΈ‘ν μ μλ νκ·λͺ¨νκ³Ό λμ‘Έμ€ μνκ΅°μ μ‘°κΈ°μ νμ
ν μ μλ μ΅μ μ μμ¬κ²°μ λͺ¨νμ κ°λ°νλλ° μλ€.μ°κ΅¬λ°©λ²μ λμ‘Έμ€ νμλ±λ‘μ¬μ
μ ν¬ν¨λμ΄ μ¬μ체μ§μ€λ¬Έκ²μ¬λ₯Ό μνν νμκ΅°κ³Ό 건κ°μΈ λμ‘°κ΅°μ 1:1 λ¨μ 무μμ μΈ΅νμΆμΆνμ¬ μνν νμλμ‘°κ΅° μ°κ΅¬μ΄λ€. μ°κ΅¬μλ£λ μ°κ΅¬ μ°Έμ¬λ₯Ό μλ°μ μΌλ‘ λμν νμλ₯Ό λμμΌλ‘ μλ©΄ λμμλ₯Ό λ°κ³ μ¦λ‘κΈ°λ‘μ§λ₯Ό νμ€μμ
μ§μΉ¨μμ μκ±°νμ¬ μμ±νμ¬ νμκ΅°μ μλ£λ₯Ό μ·¨λνμλ€. νμκ΅°μ μμΈ, κ²½μΈμ§μμ 3κ° λνλΆμλ³μμ μ
μνμ¬ μμ μ²μμΌλ‘ λμ‘Έμ€μΌλ‘ μ§λ¨λ°μ λ°λ³ 2μ£Ό(14μΌ)μ΄λ΄μ κΈμ±κΈ° λμ‘Έμ€ νμλ₯Ό λμμΌλ‘ νμλ€. λμ‘°κ΅°μ κ²½κΈ°λ μμ¬ λνλΆμλ³μμ κ²μ§μ μνμ¬ λ°©λ¬Ένμ¬ μ¬μ체μ§κ²μ¬λ₯Ό ν¬ν¨ν μ’
ν©κ²μ§μ μνν μ¬λμ€ κ±΄κ°μμ μ΄μμ λλΌκ±°λ μμ¬μ κΆμ λ‘ κ²μ¬λ₯Ό μνν μ¬λμ μ μΈνκ³ , κ²μ§μ¬μ κ° μ κΈ°μ μΌλ‘ κ²μ¬ λ°κΈ° λλ¬Έμ΄κ±°λ μ§μ₯μ λ¨μ²΄κ²μ§ νΉμ κ°μ‘± λ° μΉμ§μ κΆμ λλ¬Έμ΄λΌκ³ λ΅ν μ¬λλ€λ‘ νμλ€. κ²μ§κ²°κ³Ό νΉμ κ²μ§ν λμ‘Έμ€νμλ‘ νμΈλ κ²½μ°λ μ μΈνμλ€.μ°κ΅¬λμμλ νμκ΅° 331λͺ
, λμ‘°κ΅° 331λͺ
μΌλ‘ μ΄ 662λͺ
μ΄λ©°, μμ§λ μλ£μ λΆμμ λμ‘Έμ€ λ°μμνμμΈλ€μ λ¨μΌλ³λ λΆμμΌλ‘ μ§μ λ³μμ λν΄μλ μΉ΄μ΄μ κ³±κ²μ λλ Fisher's exact testλ₯Ό μννκ³ , μμ λ³μμ λν΄μλ λ
립 tκ²μ μ μννμλ€. μ¬μ체μ§κ³Ό λμ‘Έμ€ λ°μμνμμΈμ λΆμμ λ‘μ§μ€ν± νκ·λΆμμ μννμ¬ λΉκ΅μνλλ₯Ό ꡬνκ³ , κ΅νΈμμ©μ νμΈνμλ€. Hosmer-Lemeshow κ²μ κ°μ μ΄μ©νμ¬ μ ν©ν νκ·λͺ¨νμ ꡬμΆνκ³ , λν CART(Classification and regression tree) μκ³ λ¦¬μ¦μ μ΄μ©ν μμ¬κ²°μ λ무λΆμμ ν΅νμ¬ λμ‘Έμ€ λ°μμ κ²°μ νλ ν΅κ³νμ λΆλ₯ λͺ¨νμ ꡬμΆνμλ€.λ‘μ§μ€ν±νκ·λͺ¨νμ ν΅νμ¬ μ°λ Ήκ³Ό μ±λ³μ ν΅μ ν μνμμ μ¬μ체μ§λΆλ₯μ λ°λ₯Έ λμ‘Έμ€ λ°μ λΉκ΅μνλλ νμμΈμ λΉνμ¬ μμμΈμΌ κ²½μ° λμ‘Έμ€ λ°μ λΉκ΅μνλκ° 1.75λ°° λμμΌλ©° ν΅κ³νμ μΌλ‘ μ μνμλ€(OR=1.75, 95% CI 1.23-2.49). νμ§λ§ κ³Όκ±° λΉλ§λμ ν리λλ , κ³ νμκ³Ό λΉλ¨μ κ³Όκ±°λ ₯, κ³Όκ±°μ μμ£Όμ ν‘μ° λ±μ κ³ λ €νλ©΄ λμ± μ’μ λͺ¨νμ΄ λλ©°, μ΄λμ νκ·λͺ¨νμμ ꡬν΄μ§ νμμΈμ λΉνμ¬ μμμΈμΌ κ²½μ°μ λμ‘Έμ€ λ°μ λΉκ΅μνλλ 6.34λ°°μ΄μμΌλ©°(OR=6.34, 95% CI 3.08-13.04), λͺ¨λΈμ μ ν©λλ₯Ό 보λ Hosmer & Lemeshow ν
μ€νΈ κ²°κ³Όλ μ ν©νμλ€(X2=3.63, P-value=0.89).CARTμκ³ λ¦¬μ¦μ μμ¬ κ²°μ λ무 λͺ¨νμ ν΅ν΄ λμ‘Έμ€ λ°μμ κ²°μ νλ ν΅κ³νμ λΆλ₯ λͺ¨νμ ꡬμΆν κ²°κ³Ό κ°μ₯ μ°μ μ μΌλ‘ κ΄μ¬νλ λ³μλ μ¬νκ΄μ§ν μνμμΈμ κ΄ν κ³Όκ±°λ ₯ μ 무(κ³ νμ, κ³ μ§νμ¦, λΉλ¨λ³, ννμ±μ¬μ§ν, μΌκ³Όμ±λννλ°μμ€ νλλΌλ μλ κ²½μ°)μμΌλ©°, κ³Όκ±°λ ₯μ΄ μλ κ΅°μμλ μμμΈμ΄λ κ·Έλ μ§ μλλλ‘ κ°μ₯ ν¬κ² λλ³λμμΌλ©°, μμμΈκ³Ό νμμΈμμλ μμ£Όμ¬λΆκ° κ·Έ λ€μ κ΄μ¬νλ λΆλ₯λ³μμκ³ , μμμΈμμλ κ³Όκ±° κ·μΉμ μΈ μ΄λμ¬λΆκ° κ·Έ λ€μ κ΄μ¬νλ λΆλ₯λ³μμ΄μλ€. CART μμ¬κ²°μ λ무λͺ¨νμ μ€λΆλ₯μ¨μ 0.274μ΄μλ€.λ³Έ μ°κ΅¬λ₯Ό ν΅νμ¬ μ¬μ체μ§μ λ°λΌ λμ‘Έμ€ λ°λ³μνμ μ°¨μ΄κ° μμμ μμκ³ , λ€λ₯Έ μ¬νκ΄μ§ν μνμΈμλ₯Ό ν¨κ» κ°μ§κ³ μλ κ²½μ° κ΅νΈμμ©μΌλ‘ μνλκ° ν¬κ² μ¦κ°νλ©°, μ¬μ체μ§μ ν¬ν¨ν λμ‘Έμ€ μμΈ‘λͺ¨νμ κ°λ°ν μ μλ€λ κ°λ₯μ±μ λ³Έ κ²μ μ°κ΅¬μ μμλΌκ³ ν μ μλ€.
[μλ¬Έ]Aging population is a global trend, and increasing cases of stroke is becoming an important public health issue. Stroke may be different by constitution of a person, and the cause of stroke may be found in constitutional imbalance.The objectives of this case-control study were to investigate whether the relative risk of stroke can be different depending on Sasang constitutions classified by Sasang constitution questionnaire, to grasp interaction effects between Sasang constitution and the other risk factors, and to build the logistic regression model which can predict the risk factors of stroke including Sasang constitution and the best decision model which can detect risky group of stroke at early stage.This study was accomplished by comparing the patient group who are registered with 'storke patients registration enterprise' and filled out the Sasang constitution questionnaire, and the healthy comparison group by simple random extraction method. The data of patient group was attained by a Case Report Form based on Standard Operating Procedures, aimed to survey patients with Informed Consent, who volunteered to participate in this study.In this case, the group of patients with strokes are those whom are diagnosed, first time in their life, as acute strokes within 2 weeks(14 days) from the outbreak of illness. The comparison group are limited only among those who visited the hospital and conducted the general examination including the Sasang constitution exam and answered the reasons for taking a medical examination are a periodical check, a group-check from work or an inducement of member of family. Those who did the examination due to simple feeling of illness in health condition or an inducement of a doctor were excluded. Those who are diagnosed as a stroke with a medical examination result or after a checking-up are excluded.From October 2005 through March 2007 (18 months), the total number of subject is 662; 331 cases of stroke patients group and 331 of healthy control group. The statistical analysis was accomplished by conducting Chi-square test or Fisher's exact test on the quality variable for the univariate analysis of risk factor of stroke and conducting independent t-test for the quantity variable.The analysis between Sasang constitution and the risk factor of stroke was accomplished by conducting Logistic regression analysis in order to get the odds ratio and confirming the interaction effects. The suitable regression model was built by using the Hosmer and Lemeshow's goodness of fit test, and the best statistical classification model which decides a stroke was established by decision tree analysis using the CART algorithm.The main results of this study is as follows;In a condition that age and gender were controled by logistic regression analysis, the relative risk of stroke by Sasang constitution classification was obtained; Soyanginβs risk ratio was 1.75 times higher than Taeumin's, and it was statistically significant (OR=1.75, 95% CI 1.23-2.49).However, consideration of body mass index(BMI), waist circumference, past history of hypertension and diabetes, history of drinking and smoking makes even better model. According to that model, Soyanginβs risk ratio of stroke goes up 6.34 times higher than Taeuminβs (OR=6.34, 95% CI 3.08-13.04), and the result of Hosmer & Lemeshow goodness of fit test which determines the suitable degree of the model was appropriate (X2=3.63, P-value=0.89).According to decision tree analysis of CART algolithm, the most overriding variable was the history of risk factor of cardiovascular disease (one of followings is included ; hypertension, hypercholesterolemia, diabetes, ischemic heart disease, and transient ischemic attack). And, among the group without past history, they were divided the most if they were Soyangin or not. The next overriding variable was drinking history among Soeumin and Tarumin. Among Soyangin, the next overriding variable was regular exercise or not. The misclassification rate of CART algolithm was 0.274 though.By the result of this study, we found out the risk of stroke can be different depending on Sasang constitution, and the risk highly rises due to interaction effects with risk factor of cardiovascular disease, and most importantly, finding a possibility to develop the specific predicting model for stroke including Sasang constitution is significant object of this study.ope
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